# Memory Brain Trainer (Math) vs World Flags Challenges

The clearest difference is ads: Memory Brain Trainer (Math) at none against World Flags Challenges's shown. Memory Brain Trainer (Math) also leads on iOS requirement (6.0 vs 13.0). World Flags Challenges's advantage is update cadence (every 2 days vs every 3 months). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Memory Brain Trainer (Math) ships an update every 3 months, World Flags Challenges every 2 days. The most recent releases landed on September 10, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Memory Brain Trainer (Math) | World Flags Challenges |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 2 days** |
| Size | 57 MB | 25 MB |
| Requires iOS | **6.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [KIDEO TECH LTD](https://appshunter.io/developer/905104364) | [Vinicius Fortes](https://appshunter.io/developer/1726213069) |

## What reviewers say

### Memory Brain Trainer (Math)

[App page](https://appshunter.io/ios/app/memory-brain-trainer-math/id1020432770)

**Features:** macOS Compatibility

**In-app purchases:** none


### World Flags Challenges

[App page](https://appshunter.io/ios/app/world-flags-challenges/id6503302130)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Memory Brain Trainer (Math) free?

Memory Brain Trainer (Math) is free to download, with no in-app purchases.

### Is World Flags Challenges free?

World Flags Challenges is free to download, with no in-app purchases.

### Do Memory Brain Trainer (Math) or World Flags Challenges have ads?

World Flags Challenges shows ads; Memory Brain Trainer (Math) does not.

### Which is updated more often, Memory Brain Trainer (Math) or World Flags Challenges?

Memory Brain Trainer (Math) ships an update every 3 months, and World Flags Challenges every 2 days. Most recently, Memory Brain Trainer (Math) was updated on September 10, 2026 and World Flags Challenges on September 15, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*